Old headphones AKG K240 called “Sextett” (around 1975~1979) can be quite easly refurbished with new parts from very inexpensive “clone” headphones Superlux HD681B. Whole headband I was able to replace from Superlux to AKG headphones (it was expected as design is almost identical). Also black outside back cover (ring) was suitable to the original headphones (it was for me unexpected). On one of picture below has been marked parts form Superlux. Pros: inexpensive way to refurbish old AKG K240. Cons: outside view is not original anymore. Ear pads and cable also are brand new replacement but not form Superlux. Ear pads from Superlux HD681B should be suitable for AKG (but thicker ones are better for me).
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Hey Jarek, thanks for posting this. I’m taking on a similar project restoring an old pair of AKG K240 Sextett headphones. I’ve already replaced the foam and needed to replace the, ring loops, and I’m planning on replacing the inner headphone strap. I wanted to reach out because one thing I was struggling with was the type of adhesive you used to re-attach the silver side panels that cover the screws that allow you to disassemble the headphones. I was thinking of using hot glue but ideally I would prefer an adhesive that would release at a later date if I needed to get back for whatever reason.
Hi, I suggest to try at first thin double sided tape. If this tape will fail, then the small amount of the cheapest one component glue (cheap glue should not be powerful).Below link to cloud with more pictures. Good luck with refurbishing. Jarek